Sliding door.



Patented Apr. 29, |902. G. B. PICKUP.

SLIDING DUUR.

(Application led Jan, 15, 1902.)

(No Model.)

m m WIHHnn w an vll/ll 'Il Il.

...Nul l D R Geary@ op W E m NvEN-r ,4r-runner UNiTnn Sterns GEORGE B. PICKOP, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO Rdv F. CORBIN, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CON- NECTICUT.

SPECIFICATION forming part of Letters Patent No. 698,852, dated April 29, 1902. Application iiled January 15, 1902. Serial No. 89,826. (No model.)

T0 all whom, it may con/cern:

Be it known that I, GEORGE B. PIcKoP, a citizen of the United States, residing at New Britain,connty of Hartford, State of Connecticut, have invented certain new and useful Improvements in Sliding Doors, of which the following is a full, clear, and exact description.

My invention relates to operating devices for sliding doors whereby motion imparted to one will be mechanically transmitted to the other to cause it to move in the opposite direction.

The invention is of great utility in connection with street-car doors and the like.

The object of myinvention is to provide an operating mechanism to accomplish the above-referred-to purpose, which mechanism shall be simple, durable, and effective.

In the drawings, Figure l is an elevation of my invention, showing portions of a pair of sliding doors. In this View a portion of the mechanism is broken away for convenience of illustration. Fig. 2 is a plan View of the part shown in Fig. l. Fig. 3 is a relatively enlarged plan view of details of construction, said View being partly in section. Fig-4 is a relatively enlarged elevation of another detail of construction. Fig. 5 is a plan view of a blank for a rack of my improved form. Fig. G is a cross-section of the finished rack.

A A' are doors. Y

B B are what I shall call shive-cases.

C C are shives or grooved rollers.

C2 is a track located above the doors and upon which the grooved rollers or shives C C rest, so that the doors A A may be slid back and forth in the `usual-way.

The purpose of my invention is to provide a simple, durable, and effective mechanism whereby both doors will be opened or closed simultaneously in the event either door is opened or closed. By my improvement there is little or no lost motion and there is little or no danger of the doors becoming jammed or the apparatus broken.

D D' are toothed racks carried by the doors A A', respectively. These racks D Dl are preferably connected to the doors at some invisible point-for example,gwithin the casing 5o above the door. One convenient place for locating the connection is illustrated in the drawings, in which E E are pivots carried 1 by the shive-casesB B'. In the preferred form these racks are loosely pivoted, so that they mayhave sufficient play or independent lmovement to avoid danger of jamming and to permit the said racks to mesh properly with a pinion F. By preference the pinion F is barrel-shaped and is carried in a cage G. 6o P,This cage G is loosely supported, so that it may slide transversely in aguideway in a bracket I-I, which is secured'at anypsuitable point, preferably within the'casing above the doorlandin proper alinement with the racks D D 'I I are antifriciion-rollers carried by the cage G. The rack D passes between the antifriction-roll I and the pinion F. The rack D passes between the antifriction-roll I and 7o the pinion F, and the adjustment of the antifriction-rollers I I is such as to hold said racks in proper Ymesh Withthe said pinion. The sides or posts Hf HY o f Ythe bracket are suiciently narrow so that the teeth of the racks D D' will not engage with the same as the doors are opened or closed.

. I preferably form the racks D D of sheet metal, in which teethmay be formed at the edges of ablank, as shown in Fig. 5, which 8o edges are turned up so as to form a U-shaped orchannelbar, the upright .edges of which provide the teeth of the rack. (See Fig. 6.) Such a rack has many advantages. It is extremely light, cheap, and strong, and because it affords a positiveltwo-point bearing it will not chatter in use, but runs upon the pinion in a practically noiseless manner. Y

Obviously a variety of modifications' may be made Without departingfromthe spirit of 9o my invention. It .would-'require merelythe skill of the mechanic to reverse the parts and lgcate the operating devices-in the casing or a space below the doors instead of in the casing above the doors, as shown.

What I claim is- 1. An improvement in sliding doors, comprising a pair of doors, a rack carried by each of said doors, a swinging connection therefor, and a barrel-shaped pinion meshing with said racks whereby the motion of one is transmitted to the other, and a carrying device for said pinion.

2. Au improvement in sliding doors, comprising a pair of doors, a pivoted rack carried by each of said doors, and a pinion meshing with said racks whereby the motion of one is transmitted to the other, and a carrying device for said pinion.

3. An improvement in sliding doors, comprisinga pair of doors, a rack carried by each of said doors, anda pinion meshing with said racks whereby the motion of one is transmit? ted to the other, and a carrying device for said pinion, said carrying device being slidably mounted and having lateral movement relatively to the line of movement of said racks.

4. An improvement in sliding doors, comprising apair of doors, a rack carried by each of said doors, and a pinion meshing with said racks whereby the motion of one is transmitted to the other, and a carrying device for said pinion, said carrying device including a cage slidably movable in a bracket and means prising a pair of doors, a rack carried by each of said doors, and apinion meshing with said racks whereby the motion of one is transmitted to the other, and a carrying device for said pinion, said carrying device including a cage slidably movable in a bracket and rollers carried by said cage to hold the racks in mesh with said pinion.

6. An improvement in sliding doors and the like comprising a pair of doors, a U-shaped rack attached to each of saiddoors and apinion for mutual engagement with said racks.

7. An improvement in sliding doors and the like comprising a pair of doors, a U-shaped rack attached toV each of said doors and a barrel-shaped pinion for mutual engagement with said racks.

Signed at New Britain, Connecticut, this 13th day of January, 1902.

GEORGE B. PICKOP.

Witnesses:

G. ERNEST Roo'r, C. A. BLAIR. 

